elevation produced by the projection of the last lateral saddle replaces it. 
Mouth constricted, broader than high, in form a rather narrow crescent. 
The septa, which with the exception of a small part of the lateral saddles 
I have not been able to determine, are unknown to me. 
Dimensions. — Diameter, thirteen millimetres ; thickness, ten milli- 
metres ; height of the mouth, six millimetres. 
Delations and Differences . — Goniatites sulcata, Munster, is of all the- 
the Devonian species I am acquainted with, that which most resembles this 
form. It differs from it in its more compressed shape and in the definite 
depression that occurs in the umbilical region. 
Horizon and Locality . — This species occurs in an argillaceous and 
probably schistose rock of brownish colour in the neighbourhood of Yarra- 
lumla. I have dedicated it to the Ilev. kVilliam AYoods, Author of a work on 
Australia. 
OYRTOCERAS, Gotdfuss. 
Cyetoceras textile, L. G. de Ivoninch. 
PI. IV, Fig. 13. 
Shell of medium size, horn shaped, slightly bent on itself, section 
circular. Surface ornamented with eighteen longitudinal ribs, equidistant, 
angular, though but little projecting, which a large number of transverse 
lines of growth cutting them at right angles convert into series of small, 
Avell-marked denticulations. Septa fairly close to one another and slightly 
convex. Siphuncle like a string of beads, situated on the dorsal side of the 
shell, about a quarter of the total diameter of the septa. 
Relations and Differences. — In the form of ornamentation it resembles 
much C. qiiindecimale, Phillips, and acuticostatum, G. Sandberger. It differs 
from the first in the circular form of its septa, from the second in the limited 
number of longitudinal ridges, and from them both in the bead-like arrange- 
ment of the siphuncle. 
Horizon and Locality. — It is unfortunate that onl}^ one rather imjierfcct 
specimen of this pretty species has been found in the black limestone of the 
A’ass District. 
